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@einen tatrs gatrnt @fitte THOMAS T. MARKLAND, JR., OF PHILADELPHIA,PENNSYLVANIA. Letters Patent No. 63,407, elated-April 2, 1867;anterlated February 26, 1867.

IMPROVEMENT IN MACHINES IOR SEARPBNING SAWS.

TO ALL WHOM IT MAY GONCERN:

Be it known Ithat I, THOMAS T. MARKLAND, Jr., of the city and county ofIhiladelphia, and State of Penn- Sylvania, have invented a new anduseiul Improvement in Machines for Sharpeninglthe Teeth oi Saws; and Ido hereby declare that the following` is a full and exact descriptionthereof', reference being had to the accompanying drawings, and to theletters of reference marked thereon.

Wy invention consists in a machine for sharpeningsaws by the use of anemery or other wheel, which is adjustable to give the required angle tothe teeth, right and left, in connection with reversible portable rest,varied to suit any angle of the edges of the teeth, o r to sharpen themsquare.

The construction and operation of the machine will be understood bythefollowing description. In the accompanying drawings- Figure l is an endelevation of the improved machine.

lFigure 2 is a side elevation of the saine.

Figure 3 lis a top view or plan of ditto.

Figure 4 is a plan ot the extension rotary rest D.

Figure 5 is an edge view of the same.

Figure 6 is a reversed plan of ditto. Y

Figure 7 is a plan of the sliding rest P, to be used in sharpeningstraight saws, having a saw in connection.

Figure 8 is an end View of ditto. v

Like letters in all the tiguresindicate the saule parts.

A is an ordinary bench for holding the several parts of the apparatus. BisI a reversible and portable resin' which is supported by the standardC, there being a longitudinal slot, a, in the top of the bench toreceive the tenon 6 ci' the standard, and to provide for the shiftingot' the latter to regulate the distance of the rest from thegrinding-wheel, hereinafter described, to suitsaws of diierent sizes. Dis a rotary clamping-disk, to be used in sharpening circular saws. Ithas a central shaft, c, firmly secured therein, and projecting throughthe clamping-plate E, which is confined upon the `saw F by means of thekey df The said shaft c also projects downwards, and its in a hole inthe rest B, in which it revolves as the saw is shifted for sharpening.The clamping-disk D has extension arms e, adjustable by means of thescrews f and slots g, as seen in iigs. 4, 5, and 6, so as to regulatethe disk for saws of various sizes. The'upward projecting part oi' theshaft c is made the size ofl the eye of the smallest saws, and senlargedby means of thimbles to suitk larger eyes. For the purpose of turningthe' rest B to various angles to give the various bevels which may beAdesired to the edges of the teeth of the saws used for cross-cuttiug,it has ajoint connection withthe standard C by means of the pin it,which passes" through the cheeks it', that project from the lower sideof the rest, and through the standard. There are set-screws jj in` thearms k c of the standard, for adjusting the rest to the various angles.When the teeth of the saws are to be sharpened square across, the screwsare brought up tight to the rest when the latter is brought into ahorizontal position for that purpose, as represented in figs. I and 2.For holding the saw in position, so that it shall not shift either waywhile being filed, there is a finger, Z, on the strip G, the said striphaving a slot, m, for its adjustment,'and being` conned to the frontedge ofthe bed-plate by means oi the screw n., as seen in iig. 1. I-I isan emery-wheel, for grinding the teeth of the saws. l It is removablefrom its shaft I by means of the screw boss clamp o, so'as to change thewheel for others in accommodation to the saws, the edges of the wheelsboing made ot` such shape as to correspond to the notches or serrations,which give shape to the teeth. The said shaft I is hung on centres pp,in the arms g q, which project upward from the shaft L The said shaftturns partially 0n the centre-pins 7' r, in the jaws s s of theswivel-plate K, so that the wheel H may be shifted in and out of theserrations, there being n. handle, t, projecting from one of the arms gfor that purpose. By means of the setiscrews uit, in the cheeks r r ofone of the jaws s, the inward and outward motions of the wheel H areregulated. The swivel-plate K is adjustable on the screw-holt w. Thelatter is screwed hard upon the plate to hold it securely'in position.There may be adjustable stops, consisting oi' pins, placed in holes inthc top of the bench A, or set-screws, or other simple device, to takethe strain off theholt; When the teeth have equal angles each way theswivel may be set square across the bench. This may be done, also, whenthe teeth have unequal angles, as represented in the drawings, by makingthe edge of the grinding-wheel to correspond. L is adriving-pulley onthe shaft I. For the double purpose of blowingvthe dust from the teethof the saws, and for creating a current of air, as the shaft I revolves,to keep the teeth cool, I place fans x on the movable and standingbosses o and o. As auxiliary to the fans I place a lump of ice, M, inthe pan N, for cooling the air before it is taken up by the fans. Infigs. 7 and 8, O represents a straight saw. I is a dove-tailed rest,which slides in the female dove-tail y across the rest B, to bring theteeth of the saw iu succession into connection with the grinding-whcelII, the rotary clamping-disk D, and clamping-plate E, as well as thedove-tail plate Q, Which is merely placed in position to fill up thespace for more eiiiciently clamping circular saws, having been removed,R is a clamping-plate, for securingr the saw on the rest. S S S nre theclamps. There may be a number of holes in the plate Q, across themiddle, ranging with the centre hole, through which the lower projectionof the shaft c passes, for the adjustment of saws of different sizes, so.as to obviate the necessity of giving much variation to the extensionarms e. IThere must, in this case, be corresponding holes in the rest B.I true the edge of the emery-wbeel H, or bring it into the proper shape,by means of a hot toolor bar of iroii or copper. To give increasedexpedition to shnrpening straight saws there may be placed a pluralityof grinding-wheels, H, so as to sharpen several teeth at one operation;or there may be several cutting edges to the wheel instead of one, asrepresented in the drawings. v

What I clnim as my invention, is- I l. A reversible and portable rest,B, connected with the standard C, adjusted by means ot' the set-screwsjj, and arranged and operating substantially as described and for the'purpose specifiedl 2. The clamping-disk D and clamping-plate E, whenarranged in relation to thel rest Band saw I", substantially as and forthe purpose set forth.

3. The combination of. the clamping-board P with the rest B, operatinglsubstantially as described' and'` for the purpose specified.'

4. 'lhe combination of the shaft J', having arms q q, with theswivel-plate K, the said arms being adjusted by the set-screws u u,substantially as described and for the purpose specified.

5. The'slotted finger or catch-strip G, when arranged and operating inrelation to the saws F and O, substantially as described. l l

6. The fans at, arranged in relation to the emery-Wheel H, substantiallyin the manner described and for, the purpose specified.

y In testimony that the above is my invention I have hereunto set myhand and affixed iny seal this fourteenth day of January, 1867.

THOS. T. MARKLAND, JR. D.. s]

Witnesses:

STEPHEN Us'rrcit, JOHN Wnur.

